EFFECT OF SUDDEN CHANGES IN TEMPERATURE AND SALINITY ON DIFFERENT SIZES OF TIL4P/A Spp. | ||
| Egyptian Journal of Agricultural Research | ||
| Article 24, Volume 73, Issue 1, March 1995, Pages 273-289 PDF (4.19 M) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/ejar.1995.433245 | ||
| Author | ||
| FATMA EL-NEMAKI | ||
| Central Laboratory for Fish Research, Agricultural Research Centre, Giza, Egypt | ||
| Abstract | ||
| Abstract The effect of sudden changes of temperature and salinity on three different sizes of Tilapia Spp. was evaluated. Fish caught from the Nile river was subjected to different temperatures and salinities. Large fish responded faster than small fish when the temperature dropped from 20 to 4, 8, 10°C. However, small fish responded faster when temperature rose to 35 and 40°C. Mortality rate was 100% when the Tilapia were switched to either 4°C or 40°C. In the salinity experiments, the large fish were more sensitive to the high salinity. The mortality rate was 100%, when the fish were quickly subjected to 40, 45, 50% NaCI. It is suggested, because of these findings, that : A-Tilapia Spp. should be acclimated gradually to the different tempertaures and salinities when transferring them from one place to another. B-Transfer operation could be done during autumn and spring when the fluctuation in temperature in natural water is less. | ||
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